Possible Clues:

• Gilbertian dairymaid's capacity for endurance
• Play by yourself or with Gilbert and Sullivan
• Gilbert and Sullivan work seen to touch niece, surprisingly
• Work of G & S manifests forbearance
• An operetta, in more than one case, sounding like this
• Musical work one can play
• Forbearance evident in a G & S work
• The virtue of operetta
• Virtue is a solitary pastime
• Game likely to be lost by the hot-tempered